选择恰当的疑问词补全对话。
how what who where when
1.—____________ are you ?
—I’m fine,thank you.
2.—________ is going to swim on Sunday?
— Sam.
3.— _________ are you going to the library?
—I’m going there at two o’clock in the afternoon.
4.—___________ are you going?
—We are going to the airport.
5. —_______ are you going to do this weekend?
—I’m going to go to the park.